diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0121-vchiq_2835_arm-Implement-a-DMA-pool-for-small-bulk-t.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0121-vchiq_2835_arm-Implement-a-DMA-pool-for-small-bulk-t.patch | 124 |
1 files changed, 0 insertions, 124 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0121-vchiq_2835_arm-Implement-a-DMA-pool-for-small-bulk-t.patch b/target/linux/bcm27xx/patches-5.4/950-0121-vchiq_2835_arm-Implement-a-DMA-pool-for-small-bulk-t.patch deleted file mode 100644 index 477b64d12a..0000000000 --- a/target/linux/bcm27xx/patches-5.4/950-0121-vchiq_2835_arm-Implement-a-DMA-pool-for-small-bulk-t.patch +++ /dev/null @@ -1,124 +0,0 @@ -From c2acd59177043f78446357f560e5436b0318ceb6 Mon Sep 17 00:00:00 2001 -From: detule <ogjoneski@gmail.com> -Date: Tue, 2 Oct 2018 04:10:08 -0400 -Subject: [PATCH] vchiq_2835_arm: Implement a DMA pool for small bulk - transfers (#2699) - -During a bulk transfer we request a DMA allocation to hold the -scatter-gather list. Most of the time, this allocation is small -(<< PAGE_SIZE), however it can be requested at a high enough frequency -to cause fragmentation and/or stress the CMA allocator (think time -spent in compaction here, or during allocations elsewhere). - -Implement a pool to serve up small DMA allocations, falling back -to a coherent allocation if the request is greater than -VCHIQ_DMA_POOL_SIZE. - -Signed-off-by: Oliver Gjoneski <ogjoneski@gmail.com> ---- - .../interface/vchiq_arm/vchiq_2835_arm.c | 38 ++++++++++++++++--- - 1 file changed, 33 insertions(+), 5 deletions(-) - ---- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c -+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c -@@ -7,6 +7,7 @@ - #include <linux/interrupt.h> - #include <linux/pagemap.h> - #include <linux/dma-mapping.h> -+#include <linux/dmapool.h> - #include <linux/io.h> - #include <linux/platform_device.h> - #include <linux/uaccess.h> -@@ -28,6 +29,8 @@ - #define BELL0 0x00 - #define BELL2 0x08 - -+#define VCHIQ_DMA_POOL_SIZE PAGE_SIZE -+ - struct vchiq_2835_state { - int inited; - struct vchiq_arm_state arm_state; -@@ -37,6 +40,7 @@ struct vchiq_pagelist_info { - struct pagelist *pagelist; - size_t pagelist_buffer_size; - dma_addr_t dma_addr; -+ bool is_from_pool; - enum dma_data_direction dma_dir; - unsigned int num_pages; - unsigned int pages_need_release; -@@ -57,6 +61,7 @@ static void __iomem *g_regs; - * of 32. - */ - static unsigned int g_cache_line_size = 32; -+static struct dma_pool *g_dma_pool; - static unsigned int g_fragments_size; - static char *g_fragments_base; - static char *g_free_fragments; -@@ -161,6 +166,14 @@ int vchiq_platform_init(struct platform_ - } - - g_dev = dev; -+ g_dma_pool = dmam_pool_create("vchiq_scatter_pool", dev, -+ VCHIQ_DMA_POOL_SIZE, g_cache_line_size, -+ 0); -+ if (!g_dma_pool) { -+ dev_err(dev, "failed to create dma pool"); -+ return -ENOMEM; -+ } -+ - vchiq_log_info(vchiq_arm_log_level, - "vchiq_init - done (slots %pK, phys %pad)", - vchiq_slot_zero, &slot_phys); -@@ -339,9 +352,14 @@ cleanup_pagelistinfo(struct vchiq_pageli - for (i = 0; i < pagelistinfo->num_pages; i++) - put_page(pagelistinfo->pages[i]); - } -- -- dma_free_coherent(g_dev, pagelistinfo->pagelist_buffer_size, -- pagelistinfo->pagelist, pagelistinfo->dma_addr); -+ if (pagelistinfo->is_from_pool) { -+ dma_pool_free(g_dma_pool, pagelistinfo->pagelist, -+ pagelistinfo->dma_addr); -+ } else { -+ dma_free_coherent(g_dev, pagelistinfo->pagelist_buffer_size, -+ pagelistinfo->pagelist, -+ pagelistinfo->dma_addr); -+ } - } - - /* There is a potential problem with partial cache lines (pages?) -@@ -361,6 +379,7 @@ create_pagelist(char __user *buf, size_t - u32 *addrs; - unsigned int num_pages, offset, i, k; - int actual_pages; -+ bool is_from_pool; - size_t pagelist_size; - struct scatterlist *scatterlist, *sg; - int dma_buffers; -@@ -387,8 +406,16 @@ create_pagelist(char __user *buf, size_t - /* Allocate enough storage to hold the page pointers and the page - * list - */ -- pagelist = dma_alloc_coherent(g_dev, pagelist_size, &dma_addr, -- GFP_KERNEL); -+ if (pagelist_size > VCHIQ_DMA_POOL_SIZE) { -+ pagelist = dma_alloc_coherent(g_dev, -+ pagelist_size, -+ &dma_addr, -+ GFP_KERNEL); -+ is_from_pool = false; -+ } else { -+ pagelist = dma_pool_alloc(g_dma_pool, GFP_KERNEL, &dma_addr); -+ is_from_pool = true; -+ } - - vchiq_log_trace(vchiq_arm_log_level, "%s - %pK", __func__, pagelist); - -@@ -409,6 +436,7 @@ create_pagelist(char __user *buf, size_t - pagelistinfo->pagelist = pagelist; - pagelistinfo->pagelist_buffer_size = pagelist_size; - pagelistinfo->dma_addr = dma_addr; -+ pagelistinfo->is_from_pool = is_from_pool; - pagelistinfo->dma_dir = (type == PAGELIST_WRITE) ? - DMA_TO_DEVICE : DMA_FROM_DEVICE; - pagelistinfo->num_pages = num_pages; |